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903-0623-00 Rev. A
5.6.5 Hydrophone/Analog Plug-In (AIB-HYDRO)
Card P/N 903-0244-00
The AIB-HYDRO hydrophone plug-in module, shown below in Figure 5.6-8, is suitable for use with many
hydrophones and other types of low-level analog signals. The board is used at both ends of the system
and must be jumper configured, typically, as an input for the remote (subsea) module or as an output for
the console (surface) module per the settings in Table 5.6-7.
Table 5.6-7: Configuration Settings for AIB Hydrophone Module
The hydrophone board input circuits include a front-end preamplifier with a fixed 36 dB gain and
additional gain supplied by switch bank S1. Inputs are protected with diode clamps and current limiting
resistors as well as ultrafast fuses on the AIB motherboard. Table 5.6-8 shows the switch S1 gain settings
and corresponding maximum input voltage.
Table 5.6-8: Hydrophone Gain Settings (Defaults Shaded)
S1 Gain
Av (dB)
30
20
10
0
-3
1 = ON = CLOSED, 0 = OFF = OPEN
Focal Technologies Corp.
J13
Figure 5.6-8: AIB Hydrophone Plug-In Module
Board Set Up
Input Board (Remote)
Output Board (Console)
* Place shunts across the indicated pins of each jumper
S1 Settings
1
2
3
4
1
0
0
0
0
1
0
0
0
0
1
0
0
0
0
1
1
1
1
1
Model 903 User's Guide, FMB-X-2.5 Version
J14
S1
Jumper Configuration*
J11
J12
J13
2-3
2-3
2-3
1-2
1-2
1-2
Total Gain
Maximum Input
With Preamp
Voltage (mVpp)
66
56
46
36
33
J12
J11
J14
2-3
1-2
1
3.2
10
32
45
Page 5-31
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